Balanced puppet-valve.



No. 690,979. Patented lan. I4, |9l02.

' A. METZ.

BAL/molan PuPPET vALvE.

(Application tiled Jan. 23, 1901.)

(No Model.)

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ANDREV METZ, OF CHICAGO, ILLINOIS, ASSIGNOR TO A. METZ & COMPANY,

OF CHICAGO, ILLINOIS, A FIRM.

BLANGE PUPPETQVALVE.

SPECIFICATION forming part of Letters Patent No. 60,979, dated January 14, 1902. Application iiled January 23, 1901. Serial No. 44,347. (No model.)

To all whom t may concern.-

Beit known that I, ANDREW METZ, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Balanced Puppet- Valve, of which the following is a specification.

This invention relates to balanced valves.

The object of the invention is to provide a 1o valve which is simple in construction and efficient in operation.

A further object of the invention is to provide a double-seated valve of simple construction wherein provision is made for taking up expansion due to differing steam-pressures and wherein the valves remain positively tight when closed.

Other objects of the invention will appear more fully hereinafter.

zo .The invention consists, substantially, in the construction, combination, location, and arrangement of parts, all as will be more fully hereinafter set forth, shown in the accompanying drawings, and finally pointed out in the appended claims.

Referring to the accompanying drawings and to the various views and reference-signs appearing thereon, Figure l is a view in longitudinal central section of the valve con- 3o struction embodying the principles of inyinvention and showing the application thereof as a governor-valve. Fig. 2 is a detached detail View in section of the valve removed from its seat and casing.

3 5 In the construction and use of valves for locomotives, hydraulic or steam pumps, elevators, marine or stationary engines, reducing and governor valves, and general valve constructions wherever designed for use it is 4o desirable to provide means wherein the valve remains positively tight when closed,wherein leakage due to expansion is avoided, and wherein the effects of water-hammer are obviated'. It is among the special purposes of my invention to provide a construction of valve wherein these desirable objects are attained, and in carrying out my invention I provide a double-seated valve construction wherein the valve is seated tightly, which has 5o been difficult of accomplishment heretofore,

owing to expansion or contraction between the valve-disks of the double valve,and wherein the space between the two valve-seats is maintained at a normal pressure when the valves are seated and which pressure is lower 5 5 than that exerted upon the valves.

Referring to the accompanying drawings, reference-sign A designates the valve-stem, upon one end of which is mounted and securely held the valve-disk B. Reference-sign 6o C designates the seat for the valve-disk. Reference-sign D designates the other valvedisk and is formed with ahollow chamber and a central hub or bore E. F is the seating-surface of said valve D, and G the valveseat therefor. The valve stem A passes loosely through the central hub E of valve D and has formed integrally therewith or suitably connected thereto a piston H, arranged to operate within the chamber of valve 7o D. By this construction when both the valves B and D are seated the piston-stem A may be permitted movement lengthwise thereof relative to and independent of the valve D without unseating said valve, thus accommo- 7 5 dating for expansion or contraction due to variations in temperature of pressure, the piston H during such relative movement working freely within the chamber of valve D. In order to prevent leakage of steam, air, 8o or water by reason of the loose iit of the piston and its stem in the recess or chamber of the valve and the hub thereof, suitable packing-rings J may be mounted on the piston II. The arrows in Fig. l indicate the direction of fiow of the water, steam, air, or the like .through the valve-casing K, in which thev valve is arranged, and when the valves D and B are seated the pressure exerted upon valve D by the incoming pressure medium exceeds 9o the pressure exerted upon the under face or surface of valve B, and hence the valves are efficiently and tightly held seated, but only a comparatively small expenditure of power is required to unseat said valves, and the moment the valves D B leave their seats the pressure upon said valves becomes equalized and the valve becomes a balanced valve. In order to limit the relative movement of the piston II or the longitudinal movement of roo valve-stem A relative to valve'D, a loose connection may be provided between these parts. A simple construction is shown, wherein the hub E is slotted, as at Il, to receive a pin M, carried by a valve-stem, as clearly shown.

It will be readily seen that a valve embodying the principles above described provides a double valve with a relative movement between one of the valves and the valve-stein, thus allowing any expansion due to differing steam-pressures or to differing temperatures to be taken up. It will also be seen that when the valves are seated they remain positively held to their seats; but immediately upon being unseated the valve becomes balanced, thus rendering the construction exceedingly sensitive in operation.

As above indicated, a valve construction embodying the principles of my invention may be employed generally wherever valves are desired-as, for instance, upon steam-locomotives, hydraulic or steam pumps, elevators, marine or stationary engines, reducingvalves, governors, and the like. I have shown my invention as applied to aconstruction in which the valve may be automatically unseated, and to this end an operating-rod N may be suitably connected to the piston H, and when said rod is suitably actuated the valves D and B are unseated. lf desired, a Weighted lever O may be suitably connected to the rod N, so as to tend to unseat the valves D B, and by suitably adjusting the Weight P of said lever the pressure required to maintain the valves tightly seated may be readily regulated. To reduce friction, the connection between pivot-lever O and rod N may be through an antifriction-roller Q. A piston R, operating in acylinderS, may serve to effect the operations of the double-seated valve.

IIaving now set forth the object and nature of my invention and a construction embodying the principles thereof, I desire it to be understood that many variations and changes in the details of construction and arrangement would readily occur to persons skilled in the art and still fall within the spirit and scope of my invention. I do not desire, therefore, to be limited or restricted to the exact details shown and described; but

What I claim as new and useful and of my own invention, and desire to secure by Letters Patent of the United States, is-

l. In a valve construction, a double-seated valve arranged to be unbalanced when seated and to become balanced immediately when said valves are unseated, and an adjustable counterweight for the pressure on said valve when seated whereby said pressure may be adjustably regulated, as and for the purpose set forth.

2. A casing provided with valve-seats, a disk valve cooperating with one of said seats, a chambered valve cooperating with another of said seats, a stem connecting said valvedisk and chambered valves, said stem pro- 'vided with a piston operating Within the chamber of said chambered valves, loose connections between said chambered valve and stem, and a counterweighted operating-rod connected to said pistou, and means for actuating said rod, as and for the purpose set forth.

In a valve construction, a double-seated valve arranged to be unbalanced when seated and to become balanced immediately when said valves are unseated, in combination with an operating-rod connected to said valves, a piston and cylinder for operating said rod, and a weighted lever connected to said rod, as and for the purpose set forth.

4. In a valve construction, a double-seated valve arranged to be unbalanced when seated and to become balanced immediately when said valves are unseated, an operating-rod for said valves, and a pivotally mounted Weighted lever having loose connection with said rod, and an operating-piston connected to said rod, as and for the purpose set forth.

In witness whereof I have hereunto set my hand, this 10th day of January, 1901, in the presence of the subscribing witnesses.

ANDREWr METZ.

Witnesses:

B. W. SHURTELL, S. E. DARBY. 

